<template>
<div>
  <!-- 面包屑导航区-->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>分类参数</el-breadcrumb-item>
  </el-breadcrumb>

<!--  卡片视图区域-->
  <el-card>
    <el-alert title="注意：只允许为第三级分类设置相关参数!" type="warning"
      :closable="false" show-icon></el-alert>

<!--    选择商品分类区域-->
    <el-row class="cat_top">
      <el-col>
        <span>选择商品分类：</span>

<!--        选择商品分类的级联选择框-->
        <el-cascader expand-trigger="hover"
          :options="catelist"
          :props="cateProps"
          v-model="selectedCateKeys"
          @change="handleChange"></el-cascader>
      </el-col>
    </el-row>

    <!--tab 页签区域-->
    <el-tabs v-model="activeName"
      @tab-click="handleTabClick">
      <!-- 参加动态参数的面板-->
      <el-tab-pane label="动态参数" name="many">
        <!--添加参数的按钮-->
        <el-button type="primary" size="mini"
          :disabled="isBtnDisabled"
          @click="addDialogVisible = true">添加参数</el-button>
        <!--动态参数表格-->
        <el-table :data="manyTableData" border stripe>
          <!--展开行-->
          <el-table-column type="expand">
            <template slot-scope="scope">
<!--              循环渲染Tag标签-->
              <el-tag v-for="(item, i) in scope.row.attr_vals"
                :key="i" closable @close="handleColsed(i, scope.row)">
                {{item}}
              </el-tag>
<!--              输入文本框-->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
              </el-input>
<!--              添加按钮-->
              <el-button v-else class="button-new-tag"
                         size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button
                size="mini"
                type="primary"
                icon="el-icon-edit"
                @click="showEditDialog(scope.row.attr_id)">
                编辑
              </el-button>
              <el-button
                size="mini"
                type="danger"
                icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)">
                删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
      <!-- 添加静态属性的面板-->
      <el-tab-pane label="静态属性" name="only">
        <!--        添加属性的按钮-->
        <el-button type="primary" size="mini"
                   :disabled="isBtnDisabled"
                   @click="addDialogVisible = true">添加属性</el-button>
        <!--静态属性表格-->
        <el-table :data="onlyTableData" border stripe>
          <!--展开行-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--              循环渲染Tag标签-->
              <el-tag v-for="(item, i) in scope.row.attr_vals"
                      :key="i" closable @close="handleColsed(i, scope.row)">{{item}}</el-tag>
              <!--              输入文本框-->
              <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
              >
              </el-input>
              <!--              添加按钮-->
              <el-button v-else class="button-new-tag"
                         size="small" @click="showInput(scope.row)">+ New Tag</el-button>
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column  type="index"></el-table-column>
          <el-table-column label="属性名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作">
            <template slot-scope="scope">
              <el-button
                size="mini"
                type="primary"
                icon="el-icon-edit"
                @click="showEditDialog(scope.row.attr_id)">
                编辑
              </el-button>
              <el-button
                size="mini"
                type="danger"
                icon="el-icon-delete"
                @click="removeParams(scope.row.attr_id)">
                删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>

  <!--添加参数对话框-->
  <el-dialog :title="'添加' + titleText"
    :visible.sync="addDialogVisible" width="50%"
    @close="addDiilogClosed">
<!--添加参数对话框表单-->
    <el-form :model="addFrom" :rules="addFromRules"
             ref="addFromRef" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addFrom.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button @click="addDialogVisible = false">取消</el-button>
      <el-button type="primary" @click="addParams">确定</el-button>
    </span>
  </el-dialog>

  <!--修改参数对话框-->
  <el-dialog :title="'修改' + titleText"
             :visible.sync="editDialogVisible" width="50%"
             @close="editDiilogClosed">
    <!--添加参数对话框表单-->
    <el-form :model="editFrom" :rules="editFromRules"
             ref="editFromRef" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editFrom.attr_name"></el-input>
      </el-form-item>
    </el-form>
    <span slot="footer" class="dialog-footer">
      <el-button @click="editDialogVisible = false">取消</el-button>
      <el-button type="primary" @click="editParams">确定</el-button>
    </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  name: 'params.vue',
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 这是级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制修改参数对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addFrom: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFromRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            tigger: 'blur'
          }
        ]
      },
      //  控制修改参数对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数表单数据
      editFrom: {},
      // 修改参数表单验证规则对象
      editFromRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            tigger: 'blur'
          }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }

      this.catelist = res.data
      this.$message.success('获取商品分类列表成功!')
    },
    // 级联选择框选中项变化,会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // console.log(this.selectedCateKeys)
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的Id和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      // console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加参数对话框关闭事件
    addDiilogClosed() {
      this.$refs.addFromRef.resetFields()
    },
    // 提交添加参数事件
    addParams() {
      this.$refs.addFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addFrom.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改参数对话框
    async showEditDialog(attrId) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editFrom = res.data
      this.editDialogVisible = true
    },
    // 监听修改参数对话框的关闭事件
    editDiilogClosed() {
      this.$refs.editFromRef.resetFields()
    },
    // 点击按钮，提交修改参数事件
    editParams() {
      this.$refs.editFromRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editFrom.attr_id}`,
          {
            attr_name: this.editFrom.attr_name,
            attr_sel: this.activeName,
            attr_vals: this.editFrom.attr_vals
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数，是否继续？',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 将对 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存到数据库
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 文本框失去焦点，或按下了Enter都会触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return,则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // console.log('ok')
      // 点击按钮，展示文本输入框
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上的元素呗重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleColsed(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态改变添加参数对话框的标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped>
.cat_top{
  margin: 15px 0;
}
.el-cascader {
  width: auto;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
